Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies Update Accounting Policy Update (Details)

v3.19.1
Basis of Presentation and Significant Accounting Policies Update Accounting Policy Update (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Revenue, Performance Obligation [Line Items]    
Revenues recognized from performance obligations satisfied in previous periods $ 398 $ 394
Revenue recognized in period from unearned revenues in prior period   258
Remaining performance obligation amount 1,800 1,800
Revenue, Performance Obligation [Axis]: 2019-04-01    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount 235 235
Revenue, Performance Obligation [Axis]: 2019-09-30    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount 470 470
Revenue, Performance Obligation [Axis]: 2020-09-28    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount 423 423
Revenue, Performance Obligation [Axis]: 2021-09-27    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount 416 416
Revenue, Performance Obligation [Axis]: 2022-09-26    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount 193 193
Revenue, Performance Obligation [Axis]: 2023-09-25    
Revenue, Performance Obligation [Line Items]    
Remaining performance obligation amount $ 77 $ 77